package com.ls.aop;

import com.ls.datasource.DynamicDataSourceHolder;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import java.util.Arrays;

@Aspect
@Configuration
public class DataSourceAop {

    private Logger logger = LoggerFactory.getLogger(getClass());

    private static  String dataSource = null;

    @Pointcut("execution(public * com.ls.mapper..*.*(..))")
    public void changeDataSource(){}

    @Before("changeDataSource()")
    public void doBefore(JoinPoint joinPoint) throws Throwable {
        // 接收到请求，记录请求内容
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = attributes.getRequest();

        // 记录下请求内容
        logger.info("URL : " + request.getRequestURL().toString());
        logger.info("HTTP_METHOD : " + request.getMethod());
        logger.info("IP : " + request.getRemoteAddr());
        logger.info("CLASS_METHOD : " + joinPoint.getSignature().getDeclaringTypeName() + "." + joinPoint.getSignature().getName());
        logger.info("ARGS : " + Arrays.toString(joinPoint.getArgs()));

        logger.info("current datasource :" + dataSource);
        if("master".equals(dataSource)){
            logger.info("change datasource to slave");
            dataSource = "slave";
            DynamicDataSourceHolder.putDataSource("slave1");
        }else{
            logger.info("change datasource to master");
            dataSource = "master";
            DynamicDataSourceHolder.putDataSource("master");
        }

    }


}
